You do not need to soundproof the floor if there is no room below you.
Heavy concrete ceilings won't benefit much from the additional mass of drywall and damping compound. Instead, add a drywall layer with an air gap in between, or fill the gap with fiberglass insulation.
Soundproofing is any means of reducing the sound pressure with respect to a specified sound source and receptor. There are several basic approaches to reducing sound: increasing the distance between source and receiver, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles, or using active antinoise sound generators.
Explanation: These have silica in their cell wall which is economically exploited
heyya mate your answer is..
When we shout in a closed room the sound is produced air and reach our ears lightly because sound need a mediam to travel (ie.., AIR) (DON'T FORGET TO FOLLOW ME) MARK AS BRAIN LIST
not sure its a chance of luck
have a nice day bro